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Question

The coefficient of friction between block of mass m and 2m is μ=2tanθ. There is no friction between block of mass 2m and inclined plane. The maximum amplitude of the two block system for which there is no relative motion between both the block is:
1077966_02f833267fe7442894740742d4789f9d.png

A
gsinθkm
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B
mgsinθk
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C
3mgsinθk
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D
None of these
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Solution

The correct option is C 3mgsinθk
Here, ω=k3m

Maximum static frictional force, $f_{max}=\mu\,
mg\,cos\,\theta=2\,tan\,\theta\,mg\,cos\,\theta=2\,mg\,cos\,\theta$

Applying Newton's second law on the block at lower extreme position, we get

fmgcosθ=mω2A

f=mω2A+mgsinθ

As ffmax,

ω2A=gsinθ

or

Amplitude, A=3mgsinθk


1432348_1077966_ans_dfd1a30a60f54f2996bc9cb8ebe650cd.png

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